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Diffstat (limited to 'README')
| -rw-r--r-- | README | 23 |
1 files changed, 23 insertions, 0 deletions
@@ -1044,6 +1044,29 @@ The following options need to be configured: the malloc area (as defined by CFG_MALLOC_LEN) should be at least 4MB. + CONFIG_LZMA + + If this option is set, support for lzma compressed + images is included. + + Note: The LZMA algorithm adds between 2 and 4KB of code and it + requires an amount of dynamic memory that is given by the + formula: + + (1846 + 768 << (lc + lp)) * sizeof(uint16) + + Where lc and lp stand for, respectively, Literal context bits + and Literal pos bits. + + This value is upper-bounded by 14MB in the worst case. Anyway, + for a ~4MB large kernel image, we have lc=3 and lp=0 for a + total amount of (1846 + 768 << (3 + 0)) * 2 = ~41KB... that is + a very small buffer. + + Use the lzmainfo tool to determinate the lc and lp values and + then calculate the amount of needed dynamic memory (ensuring + the appropriate CFG_MALLOC_LEN value). + - MII/PHY support: CONFIG_PHY_ADDR |